Added '/mcnotify' command to toggle ability notifications on/off

src/main/java/com/gmail/nossr50/mcMMO.java

@@ -309,6 +309,7 @@ public class mcMMO extends JavaPlugin {
         CommandRegistrationHelper.registerSkillresetCommand();
         CommandRegistrationHelper.registerHardcoreCommand();
         CommandRegistrationHelper.registerVampirismCommand();
+        CommandRegistrationHelper.registerMcnotifyCommand();
 
         // Spout commands
         CommandRegistrationHelper.registerXplockCommand();